Rotary steam-engine.



No. 650,339. Patented May 22 I900. L. PEDERSUN.

ROTARY STEAM Enema.

I (Application flied Sept}. 29, 1899.1 6N0 Model.) 2 Shasta-Sheet I.

No. 650,339.- Patented May 22, I900.

L. PEDERSON.

ROTARY STEAM ENGINE.

(App'licstiop filed Sept. 29, 1899.) (Nd Model.) 2 Sheets-Sheet 2.

O O O O UNITED STATES PATENT Orrica.

LABS PEDERSON, OF MANITOVJOC, \VISCONSIN.

ROTARY STEAM-ENGlNE.

SPECIFICATION forming part of Letters latent No. 650,339, dated May 22, 1900.

Application filed September 29, 1899. Serial No. 732,051. (No model.)

To a. whom it may concern:

Be it knownthat I, LARS PEDERSON, a citi zen of the United States, residing at Manitowoc, in the county of Manitowoc and State of \Visconsin, have invented newan'd useful Improvements in Rotary Steam-Engines, of which the following is a specification.

My invention relates to rotary steam-engines; and its obj set is to provide an improved construction of the same whereby back pres sure of the steam on the piston is effectually prevented.

It is also an object to improve the construction generally, so that it will possess superior advantages with respect to efficiency in operation.

The invention consists in the novel construction and combination of parts hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 is an elevation of a rotary engine constructed in accordance with my invention, the removable section or part to which the rotatable piston=wheel is journaled being removed. Fig. 2 is a similar view of the removable section and piston-wheel looking from the inner side.

Fig. 3 is a horizontal section on the line a: at, Fig. 1, showing the removable section secured to the stationary section or casting.

In the said drawings the reference-numeral 1 designates the stationaryportion or section of the engine, consisting of a rectangular casing formed with a circular or cylindrical recess 2, in which the piston-Wheel, hereinafter described, rotates. Near the upper end and at opposite sides said casting is provided with valve-chambers 3, in which are seated semicylindrical or half-round oscillatory valves 4, which are pivotally connected therewith and with the removable section by journals 5. These journals extend through said casting and are connected with each other by a rod 5, so as to move in unison. These valve-chambers communicate with the recess in the casting by passages 6 and are also provided with inlet-passages 7, communicating with a steamchest 8. Each valve chamber is provided with exhaust-passages 9 and exhaust-pipes 10. Located and journaled centrally thereto is a rotatable piston 12, cut away at the inner end, asseen at 13, the outer or free ends being of awidth equal to the depth of the said recess.

The shaft of this piston extends through the casing and is provided with an eccentric 2, which is connected with one of the valves 4, as shown in dotted lines, Fig. 1. As the said piston rotates, as hereinafter described, the eccentric will operate the valve connected therewith, which, being connected with the other valve, will cause said valves to be alternately operated to open and close the steampassages, as will be understood by those acquainted with the art to which the invention pertains.

The numeral 14: designates the rotatable piston-wheel, located in said recess 2, but eccentric thereto.

The numeral 15 designates the driving shaft to which said wheel is secured, journaled to the removable section 16 and provided with a driving wheel orpulley 17. The opposite faces of this wheel, near the rim or periphery, are formed with circular grooves 18 to receive a packing 19 of any suitable material. This section is bolted to the casting 1 and in the present instance is shown as being composed of three parts or pieces, although it may be made of a single piece, if desired. Said wheel in one face is formed with a circular recess 20 and is also formed with a triangular opening 21, the sides of which are beveled, as seen at 23. The enlarged end of the piston is located in this opening and is adapted to project through an intersecting passage 24.- in the rim of the wheel, which passage is provided with guiderollers 24*.

It will be seen that at one point the pistonwheel will impinge against the casting, and owing to the eccentricity of the said wheel to the recess in the casting from said point where the wheel impinges there is a gradually-increasing space, which space is greatest at a point centrally between the valve-chambers. For the purpose of preventing escape of steam between the wheel and casting,which would tend to react or cause a back pressure upon the piston, the casting is cut away at 25, forming a curved chamberin which is 10* to said casting by a bolt 27. It will be seen that the ends of this plate are so bent that they press against the periphery of the pis ton wheel under spring tension, and thus cated a curved spring-metal plate 26, secured make a tight joint, but without interfering with the working of the wheel.

The operation is as follows: One of the valves is turned so that communication between the inlet-passages of one valve-chamher is brought into communication with'the steam-space between the piston-wheel and the casting, while the other valve is turned so as to bring the said space into communication with the exhaust-passage. Steam being now admitted to the valve-chamber first mentioned will act upon the piston and r0- tate the wheel and driving-shaft. The steam escapes through the exhaust-passage 0f the other valve-chamber. If desired, two or more pistons may beemployed, which will be preferable, so that the rotation of the wheel will be uniform.

It will be obvious that several engines may be connected togetherso as to secure uniformcity-of operation.

Having thus fully what I claim is- V A rotary engine consisting of a casinghavdescribed my invention,

ing a cylindrical recess therein and a steamehest above it, steam-ports communicating with said cylindrical recess at each side above the center thereof, circular recesses above said ports, semicircular valves seated in said recesses,inlet-ports extending from the steamchest to the inner sides of the recesses, exhaust-ports extending from the on ter sides of said recesses up through the top of the easing, a rotary piston-wheel journaled eccentrical'ly in the cylindrical recess in the easing, said wheel having triangular openings in the periphery thereof and a rotatable piston moving in said opening, the face of said piston-wheel having an anu ular groove therein, and a packing in said groove, substantiallyasdescribed. A

In testimony whereof I have hereunto set my hand in presence of two subscribing wit- LARS PEDERSON, \Vitnesses: o f I I GEORGE M; LAnsoN, ERICK J. ONSTAD. 

